Composition and method of delivery

ABSTRACT

An anhydrous composition comprising a base and a metal organic framework formed from a recyclable porous material with the material adsorbed into the metal organic framework, wherein the recyclable porous material has a structure that breaks down when contacted with water to release the material.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of application Ser. No. 13/505,859, with a 371 entry date of 3 May 2012, which is a national stage entry under 35 U.S.C. §371 of International Patent Application No. PCT/US2010/055648, filed 5 Nov. 2010, which claims priority to U.S. Provisional Patent Application No. 61/258,650, filed on 6 Nov. 2010, which is incorporated herein by reference.

BACKGROUND

There are many ways to deliver a material to a person. For some materials, the delivery may be more difficult because the material may volatilize away once delivered to a person, or the material may adversely interact with other ingredients in a composition to reduce the level of the material. Also it would be desirable to deliver a material to a person and have the material available when needed.

For personal care products, fragrance is used to provide a pleasant aroma to the product and the person. Fragrance longevity is desired to continue delivering the fragrance after the product has been applied. While fragrances can be encapsulated in various materials, there usually needs to be some mechanical action that breaks down the encapsulate to release the material. When the personal care product is an antiperspirant/deodorant, it would be desirable to release fragrance when needed during sweating.

SUMMARY

A method of delivering a material to a person comprising applying an anhydrous composition to a person, wherein

-   a) the anhydrous composition comprises a base and metal organic     framework formed from to recyclable porous material (RPM) with the     material adsorbed into the metal organic framework, and -   b) the recyclable porous material has a structure that breaks down     when contacted with water to release the material.

An anhydrous composition comprising a base and a metal organic framework formed from a recyclable porous material (RPM) with the material adsorbed into the metal organic framework, wherein the recyclable porous material has a structure that breaks down when contacted with water to release the material.

DETAILED DESCRIPTION

As used throughout, ranges are used as shorthand for describing each and every value that is within the range. Any value within the range can be selected as the terminus of the range. In addition, all references cited herein are hereby incorporated by reference in their entireties. In the event of a conflict in a definition in the present disclosure and that of a cited reference, the present disclosure controls.

Unless otherwise specified, all percentages and amounts expresser herein and elsewhere in the specification should be understood to refer to percentages by weight. The amounts given are based on the active weight of the material.

A metal organic framework (MOF) can be used to adsorb material into the pores in its structure. As used herein, the MOF does not include all MOF structures. The MOF is a recyclable, porous material (RPM), which is capable of breaking down when contacted with water. By selecting an RPM, the material can be released when contacted with water. RPMs are known. By breaking down, the bonds in the RPM that form the framework are broken, which collapses the framework structure. When the structure if broken, the material is released.

In MOFs that have been used previously to hold fragrances, the MOFs have been based on structures similar to zeolite. In these structures, the structures are more stable in water, and they maintain their structure. They release fragrances or other materials by displacement of some of the material when contacted with water. The MOF materials are kept in an anhydrous condition until use. When contacted with water, water flows into the MOF structure to displace the material. An equilibrium is reached between the material and water in the bulk composition and the material and water in the MOF structure. The equilibrium can continue to change if the material, such as a fragrance, is volatile and leaves the bulk composition. At this time, more material will move from the MOF to the bulk composition. With these types of MOF structures, it takes time to release the material, and depending on the conditions, not all of the material will be released from the MOF structure. It would be desirable to release all of the material to the bulk composition to avoid waste of the material.

The RPMs described herein are capable of having their structure broken down so that up to 100% of the material can be released.

In certain embodiments, the RPM contains a metal node that is connected with ligands. For use with compositions that will come into contact with people, the metal can be selected from Mg, Ca, Al, Zn, Fe, and Co. In certain embodiments, the ligands can be selected to be amino acids or food additives, such as citric acid.

One RPM that can be used is [Co(biphenyldicarboxylate)₃4,4′-bipyridine].4DMF.H₂O. Information can be found in RPM-1: A Recyclable Nanoporous Material Suitable for Ship-In-Bottle Synthesis and Large Hydrocarbon Sorption, Long Pan et al., Angew. Chem. Int. Ed. 2003, 42, No. 5, pp. 542-546, which incorporated herein by reference in its entirety. In this publication, [Co₃(biphenyldicarboxylate)₃4,4′-bipyridine].4DMF.H₂O is referred to as [Co₃(bpdc)₃bpy].4DMF.H₂O, wherein bpdc is biphenyldicarboxylate and bpy is 4,4′-bipyridine, and DMF refers to N,N-dimethylformamide.

Another RPM that can be used is [Co(biphenyldicarboxylate)(4,4′-bipyridine)].0.5DMF. Information can be found in RPM-2: A recyclable porous material with unusual adsorption capability: self assembly via structural transformations, Long Pan et al., Chem. Commun., 2001, pp. 854-855, which incorporated herein by reference in its entirety. In this publication, [Co(biphenyldicarboxylate)(4,4′-bipyridine)].0.5DMF is referred to as [Co(bpdc)(bpy)].0.5DMF.

Another RPM than can be used is [Zn₂(biphertyldicarboxylate)₂(1,2-bipyridylethene)].2DMF. Information can be found in RPM3: A Multifunctional Microporous MOF with Recyclable Framework and High H ₂ Binding Energy, Anjian Lan et al., Inorg. Chem. 2009, 48, pp. 7165-7173, which incorporated herein in its entirety, and in A Luminescent Microporous Metal organic Framework for the Fast and Reversible Detection of High Explosives, Anjian Lan, Angew. Chem. Int. Ed. 2009, 48, pp. 2334-2338, which incorporated herein by reference in its entirety. In this reference, [Zn₂(biphenyldicarboxylate)₂(1,2-bipyridylethene)].2DMF is referred to as [Zn₂(bpdc)₂(bpee)].2DMF, wherein bpee is 1,2-bipyridylethene.

Another RPM that can be used is Mg₃(O₂C—C₁₀—H₆—CO₂)₃. Information on this MOF can be found in Strong H2 Binding and Selective Gas Adsorption within the Microporous Coordination Solid Mg ₃(O ₂ C—C ₁₀ —H ₆ —CO ₂)₃, Mircea Dinc{hacek over (a)} et al., J. Am. Chem. Soc., 2005, 127, pp. 9376-9377, which incorporated herein by reference in its entirety.

The RPMs listed above are solids present in a solvent (such as DMF and water). After the network is formed, the solvent can be driven off by heating.

The RPM containing the material can be incorporated in an anhydrous composition. By anhydrous it is means that the composition contains less than 5% free water. In certain embodiments, there is no free water. When calculating the water, water molecules that are part of a hydrate of a material are not counted.

The anhydrous composition comprises a base. The base can be any conventional composition. In some embodiments, the composition is an antiperspirant and/or deodorant composition. Examples of these types of compositions are sticks, soft solids, gels, and aerosols. The composition can also be a perfume composition. Antiperspirant/deodorants are applied to axillary areas of a person.

The material can be any material whose molecules can adsorb into the pores of the RPM. Examples of materials include, but are not limited to, fragrance, flavoring agent, antioxidants, vitamins, and, coenzyme Q10.

In one embodiment, the material is a fragrance. By delivering fragrance that is adsorbed into the pores of the RPM, fragrance can be delivered to a person and stored until needed. For antiperspirants/deodorants, fragrance will be released as a person perspires and sweat (water) is released and contacted with the RPM. Fragrance will be delivered when it is needed to mask the odors associated with sweating. In certain embodiments, RPMs can hold an amount of fragrance that is up to 80% of the weight of the RPM.

The amount of RPM used depends on the holding capacity of the RPM. Typically, the amount of fragrance in a composition is 0.1 to 5 weight % of the composition. Using an RPM can reduce the amount of fragrance needed for a composition because the fragrance can be released when needed. Typically, excess fragrance is needed in a composition to maintain the fragrance in the composition over the intended use of the product. For antiperspirants/deodorants, this is typically 24 hours.

Fragrance molecules that can be used are any that have a size that fit within the pores of the RPM. Additional fragrance molecules that do not fit within the RPM can be included in the base portion of the composition. Overall, the composition can contain fragrance molecules that all fit within the RPM or a portion fit within the RPM and a portion is in the base. Fragrances can be optimized for each specific RPM based on physical and chemical properties that include solubility, volatility, stability, molecular size, chemical functionality (alcohols, esters, aldehydes, ketones, etc.), cost, odor impact (threshold and intensity), ability to reduce malodor perception through various means, and odor character (to provide range of character for creative perfumery). These fragrances can be synthetic fragrance materials or they can be extracts of natural products, such as essential oils.

In another embodiment, the material can be a flavoring agent. An RPM containing a flavoring agent can be incorporated into any anhydrous composition that contains a flavoring agent. In some embodiments, the composition can be an oral care composition.

SPECIFIC EMBODIMENTS

Fragrance release was examined in a closed system using NMR (Varian VNMRS 300 MHz over a period of ten hours) at 25° C. Using the free fragrance in deuterium oxide as the backdrop, fragrance in RPM₃-Zn was measured hourly to see the increasing intensity of the fragrance. The fragrance used was Ethyl Butyrate, a hydrophobic fragrance.

Each prepared sample had 3.5 mg (3.98 μL) Ethyl Butyrate. For this, fragranced RPM3-Zn was used containing 14% ethyl butyrate. The first sample was the free fragrance and was prepared as follows: 3.98 μL in 500 μL D₂O. The second sample was 25 mg of RPM3-Zn (14% fragrance=3.5 mg) in 500 μL D₂O.

In the NMR study, a steady increase was observed and then the intensity remained constant once reaching the maximum fragrance abundance. The free fragrance has a linear behavior in that over time, its intensity is constant. The RPM3-Zn on the other hand shows an increasing trend where once maximum abundance is reached, a steady linear behavior occurs. The table below lists the data.

24.998 mg RPM3-Zn + Free Fragrance Intensity 500 μL D₂O 4 μL Ethyl Butyrate + Time Fragrance Intensity 500 μL D₂O Instantaneous 117641 4422402 One hour 1250242 Two hours 2750685 Three hours 2934370 4676620 Four hours 2859726 Five Hours 3029066 Six Hours 3199534 4650881 Seven Hours 3393394 Eight Hours 3494312 Nine hours 3149451 4640791 Ten Hours 3639734

The above testing was repeated except that the fragrance used was D-limonene, which is a hydrophilic fragrance, and the system was open. The same weight loading of fragrance was used.

24.998 mg RPM3-Zn + Free Fragrance Intensity 500 μL D₂O 4 μL D-limonene + Time Fragrance Intensity 500 μL D₂O Instantaneous 0 936335 One hour 0 900514 Two hours 160474 835111 Three hours 287598 692984 Four hours 491047 400856 Five Hours 236325 145169 Six Hours 222454 96834 Seven Hours 233437 0 Eight Hours 238739 0 Nine hours 236447 0 Ten Hours 234271 0

The free fragrance had a linear decrease in intensity, and it completely left the solvent after seven hours. The RPM3-Zn had a ramp up in intensity through the first couple of hours, and then it had a steady release, of fragrance. 

What is claimed is:
 1. An anhydrous antiperspirant composition comprising: a) an antiperspirant; b) a base; c) a metal organic framework formed from a recyclable porous material (RPM), wherein the RPM is at least one RPM chosen from [Co₃(biphenyldicarboxylate)₃4,4′-bipyridine], [Co(biphenyldicarboxylate)(4,4′-bipyridine)], [Zn₂(biphenyldicarboxylate)₂(1,2-bipyridylethene)], and Mg₃(O₂C—C₁₀—H₆,—CO₂)₃, and d) a material adsorbed into the metal organic framework, wherein the anhydrous antiperspirant composition is directly applied to an axillary area of a person, wherein the recyclable porous material has a structure that breaks down when contacted with water to release the material.
 2. The composition of claim 1, wherein the anhydrous composition is a stick, an aerosol, a soft solid, or a gel.
 3. The composition of claim 1, wherein the RPM is [Co₃(biphenyldicarboxylate)₃4,4′-bipyridine].
 4. The composition of claim 1, wherein the RPM is [Co(biphenyldicarboxylate)(4,4′-bipyridine)].
 5. The composition of claim 1, wherein the RPM is [Zn₂(biphenyldicarboxylate)₂(1,2-bipyridylethene)].
 6. The composition of claim 1, wherein the RPM is Mg₃(O₂C—C₁₀—H₆—CO₂)₃.
 7. The composition of claim 1, wherein the material is at least one material chosen from fragrance, flavoring agent, antioxidant, vitamin, and coenzyme Q10.
 8. The composition of claim 1, wherein the material comprises a fragrance.
 9. The composition of claim 1, wherein the material is released when a person perspires and sweat released contacts the RPM. 